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Y M. HU-TIN & M. LEBLANC. CONVERTER 0E FREQUENCY EUR ALTERNATING ELECTRIC GURRENTS.

No. 557,094. Patented Mar. 24, 1896.

AN DREW BGRAHM. PHUTDMYNO. WASHINGTDN. D C.

2 Sheets-Sheet 2.

M. HUTIN 8v M. LEBLANC. CONVERTER 0F FREQUENCY ECR ALTERNATING ELECTRIC CURRENTS.

Patented Mar. 24, 1896.`

(No Model.)

-E /7 my@ UNITED STATES PATENT OFFICE.

MAURICE llUTIN ARD MAURICE LEBLANC, OF PARIS, FRANCE, ASSIGNORS lO THE SOCIETE ANONYME POUR LA TRANSMISSION DE LA FORCE PAR nELEc'rEIcIrE, or SAME rLAcE.

CONVERTER OF FREQUENCY FOR ALTERNATING ELECTRIC CURRENTS.

SPECIFICATION forming part of Letters Patent No. 557,094, dated March 24, 1896.

Original application led March 13, 1894, Serial No. 503,524. Divided and this application filed March 3, 1896. Serial No. 581,683. (No model.) Patented in France October 8,1891,1\To,216,620; in Germany October 30, 1891,1To. 72,461,2Lndin Austria-Hungary October 23, 1892,110. 20,131 and No. 42,071.

To @ZZ wir/0711, it may concern:

Be it known that we, MAURICE HUTIN and MAURICE LEBLANC, citizens of the Republic of France, and residents of Paris, in the Department of the Seine, in the Republic of France, have invented certain new and useful Improvements in Converters of Frequency of Alternating Electric Currents, (the same having been patented in France, No. 210,020, dated October 8, 1891; in Austria-Hungary, No. 20,131 and No. 42,071, dated October 23, 1802, and in Germany, No. 72,401, dated October 30, 1891,) of which the following is a specification.

This invention has reference to the conversion of alternating electric currents of any frequency and tension, coming from any source, into alternating currents of any other frequency and tension.

To the apparatus which is required for the practice of this invention we have given the name converter of frequency and tension, but it may be used for the conversion of frequency alone, in which case the apparatus becomes a converter of frequency pure and simple. The conversion of frequency of alternating currents we have utilized in connection with a system of generation of alternating currents of very high frequency, set forth in our pending application, Serial No. 503,524, led March 13, 1804, of which this is a division; but it may be utilized for many other purposes and independently of any particular system of generation of currents. The invention will, therefore, come into use wherever there is a line of distribution charged with alternating currents of a given frequency, and where the translating devices to be operated require for successful and efficient operation currents of another frequency.

In the accompanying drawings, which form a part of this specification, we have illustrated Ain Figure 1 one form of our converter of frequency, mainly in diagram, and in Fig. 2 a modiiied construction of the saine.

Refer ing now more particularly to Fig. 1, the apparatus is constructed as follows: There is a ri n g-corc 21 ,which ordinarily will be made of laminated soft iron, but which, for currents of rather high frequency, should be of insu- 5o lating material to prevent loss of energy by hysteresis. Upon the ring-core are placed four series of coils, which in the drawing are distinguished from each other by different shadings and by different thicknesses or char- 55 aeters of the lines; but it must be understood that this Inode of distinguishing the sets of coils from each other is not intended to con vey an idea of the relative thicknesses ofthe wires.

The four sets of coils are Inarked 23 24 25, respectively. The set of coils 22 is wound upon the core and connected like the coils of a Gramnie ring-that is to say, the successive coils of this set are connected in a closed series. Y rlhe set of coils 23 is arranged in precisely the saine manner. The set of coils 24 has also its successive coils connected in series, but the series is not closed upon itself but terminates at 24' 242, and these terminals are connected with the conductors 17 18, respectively. The fourth set of coils 25 is wound in the saine manner as the set of coils 24, and its terminals 25 252 are connected with the conductors 17 18.

The conductors 17 18 and 17 18 must be understood to be extended so as to constitute a two-phase system of distribution, connected either with a generator or generators of twophase alternating currents, or with translating devices adapted to be operated by twophase currents, or with both.

The two-phase alternating currents, either fed into or obtained from the apparatus by the conductors 17 18 17 18', may be derived from 8 5 a Inonophase alternating current by means of condensers or may be combined into a monophase current by condensers in the manner set forth in our Letters Patent No. 530,032, granted to us on March 10, 1895, or by other suitable means, as will be readily understood by those skilled inthe art.

Supposing now that the conductors 17 18 and 17 18 convey currents from an external source or sources to the converter, and that 9 5 the currents iu conductors 17 18 are dephased,

quency, at the moments when either of the brushes 29 30 bridge two consecutive segments of a commutator one of the coils of the series 22 or 23 would be short-circuited and a considerable amount of energy needlessly consumed thereby, if the circuits of the coils were continuous. To obviate this difficulty, the metallic continuity of these circuits must be interrupted by means which permit the passage of alternating currents-namely, by condensers of suitable capacitye-and we insert such condensers at the proper places-as, for instance, in the connections 2S 28, between the coils and commutators. These condensers are marked with the numeral 30.

If only a single pair of brushes 37 or 3S is used to convey a monophase alternating current to the converter, the result will be a monophase current of changed period, which may be derived either from the conductors 17 1S or 17' 18C For such work the converter will have only a single set of coils 22 or-23, a single set of coils 2i or 25, and a single pair of brushes 2f) or SO. Conversely, this converter of frequency is also adapted for the simultaneous conversion of any number of alternating currents which are dephased with reference to each other. The number of sets of primary and secondary circuits will then be adapted to the number of dephased currents, and the commutator will have as many rings with corresponding sets of brushes as there are circuits of each kind.

XVe are not confined to the exact details of construction herein described, since the same can be obviously varied in a variety of ways that will readily suggest themselves to those skilled Ain the art. More particularly are we not confined to the particular winding and connections of the converter described with reference to Fig. 1, since it is quite practicable to close each series of the coils upon itself, as is shown in Fig. 2. ln this case the coils 22 23 are arranged and connected with commutators the same as shown in Fig. l, but the sets of coils 24 25 are each closed upon themselves and are each tapped at diametrically-opposite sides. Since all parts correspending to those in' Fig. l are here marked with the same numerals, no further description is deemed necessary.

Having now fully described our invention, we claim and desire to secure by Letters Patentl. rlhe method of transforming an altern ating electric current of one periodicity into an alternating current of another periodicity, which consists in successively and continuously changing the points of line connection in either direction around a commutator apparatus, substantially as described.

2. The method of converting alternating currents of a given frequency into alternating currents of different frequency, by producing, by the currents to be converted, a

magnetic iield or iields rotating with the frequency of said currents, accelerating or retarding the rotation of said field or iields to the desired frequency, and generating currents bythe inductive influence of the accelerated or retarded field, or fields, substantially as described.

3. The method of producing alternating electric currents of any desired frequency from currents of a given frequency by the intermediary of the primary and secondary circuits of a transformer, which consists in passing the currents of the given period through the primary circuits and shifting the points of connection of either of the circuits and the line, relatively to the polarity of the primary, substantially as described.

a. The method of changing the relative periods of primary and secondary alternating currents, which consists in producing there- With a moving line or lines of polarity in a transformer, and producing in effect a variation in the speed of rotation of polarity by shifting the points of electrical connection, substantially as described.

5. A converter of frequency of alternating electric currents,consisting of an induced and an inducing member, a commutator apparatus connected with one member and brushes connected with a source of alternating currents, bearing upon the commutator and adapted to be rotated about the same in either direction, substantially as described.

6. As a means of converting alternating electric currents of one period into currents of another period, the combination of a transformer provided with primary circuits charged with alternating currents generating a rotating magnetic iield or fields, and a secondary circuit or circuits to co-operate therewith, with a commutator apparatus connected at suitable intervals with either of these circuits, brushes bearing upon the commutat-or and means for rotating the brushes in either direction, substantially as described.

7. A converter of frequency of alternating electric currents consisting of the combination of two or more primary circuits adapted to be charged with dephased alternating currents te produce a rotating line or lines of polarity and one or more secondary circuits; a commutator-ring for each primary circuit and brushes bearing upon the commutatorrings and adapted to be rotated about the same, in either direction, substantially as described.

In testimony whereof we have signed our names to this specilication in the presence of two subscribing witnesses.

MAURCE llUTIN. MAURICE LEBLANC. aWitnesses:

CLYDE SHnorsHn-m, PAUL Bour..

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